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ultrahost.cz

DNS Records

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Hosting & Network

ultrahost.cz runs on AS204666, with DNS by Cloudflare and email configured.

Hosting network
AS204666AS204666
Managed DNS
Cloudflare
Email
Configured
IPv6 (AAAA)
Not enabled
CAA pinning
None

Sits alongside 166 other sites on AS204666.

Recently changed networks: Cloudflare (AS13335) → AS204666 (as of Nov 8, 2026)

The apex and www are the same hosting — the apex via A records, www via a CNAME to ultrahost.cz.

DNS Records for ultrahost.cz

HostnameTypeTTLPriorityContent
ultrahost.czMX010mail.hostmailer.cz
ultrahost.czNS0emma.ns.cloudflare.com
ultrahost.czNS0dylan.ns.cloudflare.com
ultrahost.czSOA1800dylan.ns.cloudflare.com dns.cloudflare.com 2419296164 10000 2400 604800 1800
ultrahost.czTXT0v=spf1 ip4:5.59.103.9 ip6:2001:67c:152c:10::a mx -all
ultrahost.czA05.59.102.14
www.ultrahost.czNS0emma.ns.cloudflare.com
www.ultrahost.czNS0dylan.ns.cloudflare.com
www.ultrahost.czTXT0v=spf1 ip4:5.59.103.9 ip6:2001:67c:152c:10::a mx -all
www.ultrahost.czCNAME0ultrahost.cz
www.ultrahost.czSOA1800dylan.ns.cloudflare.com dns.cloudflare.com 2419296164 10000 2400 604800 1800
www.ultrahost.czA05.59.102.14
www.ultrahost.czMX010mail.hostmailer.cz

Get alerted the moment ultrahost.cz's DNS changes

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DNS monitor showing the hosting provider, current A, MX, NS, and TXT records, and a history of MX and TXT changes

Uptime

We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.

DNS changes

We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.

TLS certificate

We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.

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Beta

Answers use the live DNS records shown on this page. AI-generated — double-check anything important.

About DNS Records

DNS (Domain Name System) records are instructions that provide information about a domain, including its IP addresses, mail servers, and other services. Common record types include:

  • SOA (Start of Authority) - Contains administrative information about the zone
  • NS (Nameserver) - Specifies authoritative nameservers for the domain
  • A (Address) - Maps a domain to an IPv4 address
  • AAAA - Maps a domain to an IPv6 address
  • CNAME (Canonical Name) - Creates an alias pointing to another domain
  • MX (Mail Exchange) - Specifies mail servers for the domain